Door-spring.



' No. 724,152. l

'PATBNTBDMAR s1, 190s.

DOOR SPRING.

ArPLIoATIoN FILED JUNI: so, 1902.

H0 MODEL.

plate l through the openings 9.

NITED STATES PATENT OFFICE.

JOSEPH H. ANDERSON, OF ST. LOUIS, MISSOURI.

Doon-SPRING.

A SPECIFICATION forming part of Letters Patent No. 724,152, dated March 31, 1903.

' Application tied June so, 19o?.` 4serian Nd. 113,852. (No model.)

To all whom t may concern/.-

Be it known that l, JOSEPH H. ANDERSON, of the city of St. Louis, State of Missouri, have invented certain new and useful Im.- provements in Door-Springs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to door-springs, and has for its principal object to furnish doors with a spring that will close the door when open and hold the door open when desired.

My invention consists of the parts and in the arrangement and combination hereinafter described.

In the accompanying drawings, which form a part of this specification, Figure 1 is a top plan View of my device attached to a door, the door being closed, with a projection showing the position of the parts when the door is partially opened. Fig. 2 is a perspective of my device attached to a door, the door being closed. Fig. 3 is a perspective of the adjustment of my spring to the door-frame.

In my device the flange-plate l'is fastened rigidly at its base upon the door-frame in any suitable manner. The fork 2 .is pivoted to the plate l at the outer extremity of its flanges by the pivots 3, which are spaced apart and are in vertical alinement. The handle of the fork 2 terminates in the loop 4, by means of which the fork is slidably mounted on the guide-bar 5, which guide-bar is rigidly attached at each end to the surface of the door and in alinement with the plane of its swing. The coil-spring 6 is attached to the yoke 2 by means of a projection 7, over which it is hooked, and at its other extremity is hooked over the rod 8, which is inserted in the flange' The openings 9 are arranged lin series and alinement in the top and bottom flanges of the plate 1, so that the tension of the spring 6 may be regulated by the adjustment of the rod 8.

It will be noticed that the arms or prongs of the fork 2 are spaced apart to iit over the pivots 3, and as each of the prongsis pivoted in a different horizontal plane the handle of said fork, and consequently the loop or eye 4 carried by the same, will always be firmly and securely held in a horizontal position. This is necessary, for the reason that should the handle of the fork, or more particularly the eye or loop carried by the same, become out of alinement with the guide-rod 5 there would be a biting contact between the walls of the loop and the guide-bar, which would prevent or aiect the operation of these two parts. It will also be noticed by observing the drawings and the foregoing description that the handle and the prongs of the fork 2 form an outwardly-arched structure. This is necessary, for the reason that the strain on the same is inwardly, and being arched outwardly this makes a stronger and more durable construction. It will also be seen that the spring 6 is located midwaybetween the prongs of the fork 2, thereby imparting to each an equal strain, and the prongs also protect the spring from injury or accidental displacement.

The bar 5 may be of any desired shape, provided it is adapted to receive the loop 4 and to guide it in a line vertical to the line of the door-casing. Preferably Vit is 'made in L form and its unattached end screwed into the receiving-bracket 10.

In the operation of my device it is obvious that the tension of the coil-spring 6 is gradually relaxed as the door is opened, and that its action is neutral, or nearly so, when the door is at right angles to the wall, and that its tensional strength is again exerted upon the yoke 2 when the 'door is moved either way, and when it isdesired to keep the door opened that the result is attained by throwing the door backward toward the wall at any angle beyond that of ninety degrees, whereupon the action of the spring will draw the door to the wall and hold it in position.

The principal advantages of my construction are as follows: My device is readily adj ustable to any degree of tension desired, the spring is protected from external injury by being secured within the arms of the fork, and the device is equally adapted to close or to keep open the door to which it was attached.

What I claim as new, and desire to obtain by Letters Patent, is-

In a door-closing device, the combination of a stationary supporting attachment to be applied to the door-frame, a spring, a guide'- rod carried by 'the door, an arm through which the power of the spring is communicated to the door pivoted at one end to the stationary attachment and engaging at its other end with the guide-rod upon the door, the said arm being forked and its forked end pivoted to the attachment, and the spring being arranged in line with the stem or handle of the forked arm and between the legs'of the fork, whereby its power is applied centrally to the arm, and a rod 8 to which the inner end of the spring is attached arranged to be adj ustably supported in the stationary attachment and disposed eccentrically to the pivots of the forked arm, substantially as set forth.

In testimony whereof I affix my signature in presen-ce of two Witnesses.

JOSEPH H. ANDERSON.

Witnesses:

ALFRED A. EICKS, W. F. HATCH. 

